ON-VEHICLE PROGRAM IDENTIFYING RECEIVER

摘要

PURPOSE:To generate a warning against a long-time absence from an automobile by comparing the output of a main switch which supplies electric power to the on-vehicle receiver with the output of the battery while the engine key of the automobile is extracted. CONSTITUTION:The receiver to be mounted on a vehicle has a function for tape- recording plural desired programs set with a program setting switch 6 by a cassette deck 12, and respective parts of the receiver are powered on by a battery power source 14 through the main switch SW15. The electric power 14 is inputted to an accessory key state detecting circuit 17 through an accessory key SW16 associated operatively with the engine key of the vehicle. The circuit 17 is further supplied with the voltage of the power source 14 even through the SW15 and when the SW15 is on even with the SW16 off, the circuit 17 sends a trigger signal to a monostable multivibrator 18 to allow an alarm 19 to generate a buzzer sound for a time determined according to the time constant of the monostable multivibrator 18.